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300-410 Practice Question: Which THREE symptoms indicate that route…
Which THREE symptoms indicate that route summarization may be causing routing issues in a network? (Choose THREE.)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Suboptimal routing paths are observed for certain destinations.
Route summarization can cause suboptimal routing because the summary route may point to a less specific path. It can also cause black holes if the summary route is advertised but the specific subnets are not reachable. Additionally, summarization can hide more specific routes, leading to routing loops if the summary route is less specific and points to a router that does not have the specific subnet. High CPU usage is not a direct symptom of summarization issues, and duplicate IP addresses are unrelated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Suboptimal routing paths are observed for certain destinations.
Why this is correct
Summarization can cause routers to choose a less specific route, leading to suboptimal paths.
- ✓
Traffic to some subnets is dropped (black hole) even though the summary route exists.
Why this is correct
If the summary route is advertised but the specific subnet is not reachable, traffic may be dropped.
- ✓
Routing loops occur due to less specific summary routes pointing to routers that lack the specific subnet.
Why this is correct
This can happen if the summary route is not properly configured to cover all subnets.
- ✗
High CPU utilization on routers due to frequent SPF calculations.
Why it's wrong here
Summarization typically reduces SPF calculations, not increases them.
- ✗
Duplicate IP addresses are detected in the network.
Why it's wrong here
Duplicate IP addresses are a configuration error unrelated to route summarization.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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